316不锈钢杆与刚性平面的冲击:理论、实验和数值模拟

IF 6.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Yifan Wang, Xuan Ye, Hao Yan, Tao Wang, Guangyan Huang, Zhuo Zhuang
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引用次数: 0

摘要

细长的杆在冲击时受到全局振动。在这项研究中,我们展示了316不锈钢杆在与刚性平面垂直碰撞时的轴向响应的实验、数值和理论研究。结合接触模型和一维波动方程,我们首先建立了基于统一理论框架的半解析杆体垂直碰撞模型,该模型考虑了冲击端不同的几何形状,包括半球形鼻翼、截锥形鼻翼和平端。此外,我们在这些棒上进行了自由落体实验和数值模拟来验证理论模型。结果表明,应变率效应使杆头变硬,即使在低至几m / s的速度下,应变率效应也不容忽视。提出动态修正因子对准静态接触模型进行调整后,理论、数值和实验结果吻合较好。此外,三维有限元模拟结果表明,实验结果与预测结果之间的轻微偏差是由于液滴中杆的轻微倾斜造成的。此外,我们利用理论工具和有限元模拟比较了不同冲击端杆的力学响应,并对杆鼻的选择提出了建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A 316 stainless steel rod impacts with a rigid flat: Theory, experiment, and numerical simulation

A slender rod suffers global vibration in impact. In this study, we present the experimental, numerical, and theoretical studies of the axial responses of a 316 stainless steel rod during vertical impact with a rigid flat. Combining the contact models and the one-dimensional (1D) wave equation, we first develop a semi-analytical vertical impact model for the rods based on a unified theoretical framework, which considers different geometries of the impacting end including the hemispherical nose, the truncated conical nose, and the flat end. Furthermore, we perform free-drop experiments on these rods and numerical simulations to verify the theoretical models. The results show that the strain-rate effect hardens the rod nose and should not be ignored even at a velocity as low as a few meters per second. After the proposal of a dynamic correction factor to adjust the quasi-static contact model, the theoretical, numerical, and experimental results agree well with one another. Also, the three-dimensional (3D) FEM simulations show that the slight deviations between the experimental and the predicted results are due to the slight obliqueness of the rods in the drop. Additionally, we leverage the theoretical tool and FEM simulations to compare the mechanical responses of rods with different impacting ends, and suggestions about the selection of rod noses are obtained.

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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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